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Expected Positive Exposure. The Expected Positive Exposure (EPE) is the weighted average over time of the expected exposure, where the weights are the proportion that an individual expected exposure represents of the entire exposure horizon time interval [1]. The EPE can be calculated as.
PPV is the chance that a person with a positive test has cancer. NPV is the chance that a person with a negative test does not have cancer. PPV and to a lesser degree, NPV are affected by the prevalence of disease in the screened population.he performance of screening tests is usually measured in terms of sensitivity, specificity, and positive-predictive values (PPV) and negative-predictive values (NPV). Sensitivity is the chance that a person with cancer has a positive test.